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Don't use exceptions in low-level mem allocator

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This commit is contained in:
Howard Chu 2022-05-08 17:34:14 +01:00
parent ae8e98b681
commit 6f756473c0
8 changed files with 121 additions and 68 deletions
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2
CMakeLists.txt
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@ -39,7 +39,7 @@ src/bytecode_machine.cpp
src/cpu.cpp
src/dataset.cpp
src/soft_aes.cpp
src/virtual_memory.cpp
src/virtual_memory.c
src/vm_interpreted.cpp
src/allocator.cpp
src/assembly_generator_x86.cpp

9
src/allocator.cpp
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@ -29,7 +29,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include <new>
#include "allocator.hpp"
#include "intrin_portable.h"
#include "virtual_memory.hpp"
#include "virtual_memory.h"
#include "common.hpp"
namespace randomx {
@ -50,11 +50,14 @@ namespace randomx {
template struct AlignedAllocator<CacheLineSize>;
void* LargePageAllocator::allocMemory(size_t count) {
return allocLargePagesMemory(count);
void *mem = allocLargePagesMemory(count);
if (mem == nullptr)
throw std::bad_alloc();
return mem;
}
void LargePageAllocator::freeMemory(void* ptr, size_t count) {
freePagedMemory(ptr, count);
};
}
}

2
src/dataset.cpp
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@ -42,7 +42,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "common.hpp"
#include "dataset.hpp"
#include "virtual_memory.hpp"
#include "virtual_memory.h"
#include "superscalar.hpp"
#include "blake2_generator.hpp"
#include "reciprocal.h"

4
src/jit_compiler_a64.cpp
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@ -31,7 +31,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "superscalar.hpp"
#include "program.hpp"
#include "reciprocal.h"
#include "virtual_memory.hpp"
#include "virtual_memory.h"
namespace ARMV8A {
@ -93,6 +93,8 @@ JitCompilerA64::JitCompilerA64()
, literalPos(ImulRcpLiteralsEnd)
, num32bitLiterals(0)
{
if (code == nullptr)
throw std::runtime_error("allocMemoryPages");
memset(reg_changed_offset, 0, sizeof(reg_changed_offset));
memcpy(code, (void*) randomx_program_aarch64, CodeSize);

4
src/jit_compiler_x86.cpp
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@ -34,7 +34,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "superscalar.hpp"
#include "program.hpp"
#include "reciprocal.h"
#include "virtual_memory.hpp"
#include "virtual_memory.h"
namespace randomx {
/*
@ -225,6 +225,8 @@ namespace randomx {
JitCompilerX86::JitCompilerX86() {
code = (uint8_t*)allocMemoryPages(CodeSize);
if (code == nullptr)
throw std::runtime_error("allocMemoryPages");
memcpy(code, codePrologue, prologueSize);
memcpy(code + epilogueOffset, codeEpilogue, epilogueSize);
}

8
src/randomx.cpp
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@ -113,6 +113,10 @@ extern "C" {
cache = nullptr;
}
}
if (cache && cache->memory == nullptr) {
randomx_release_cache(cache);
cache = nullptr;
}
return cache;
}
@ -162,6 +166,10 @@ extern "C" {
dataset = nullptr;
}
}
if (dataset && dataset->memory == nullptr) {
randomx_release_dataset(dataset);
dataset = nullptr;
}
return dataset;
}

134
src/virtual_memory.cpp → src/virtual_memory.c
View File

@ -26,9 +26,7 @@ OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "virtual_memory.hpp"
#include <stdexcept>
#include "virtual_memory.h"
#if defined(_WIN32) || defined(__CYGWIN__)
#include <windows.h>
@ -40,10 +38,12 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
# if TARGET_OS_OSX
# define USE_PTHREAD_JIT_WP 1
# include <pthread.h>
# include <sys/utsname.h>
# endif
#endif
#include <sys/types.h>
#include <sys/mman.h>
#include <errno.h>
#ifndef MAP_ANONYMOUS
#define MAP_ANONYMOUS MAP_ANON
#endif
@ -53,27 +53,48 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#define PAGE_EXECUTE_READWRITE (PROT_READ | PROT_WRITE | PROT_EXEC)
#endif
#if defined(_WIN32) || defined(__CYGWIN__)
std::string getErrorMessage(const char* function) {
LPSTR messageBuffer = nullptr;
size_t size = FormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
NULL, GetLastError(), MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (LPSTR)&messageBuffer, 0, NULL);
std::string message(messageBuffer, size);
LocalFree(messageBuffer);
return std::string(function) + std::string(": ") + message;
#if defined(USE_PTHREAD_JIT_WP) && defined(MAC_OS_VERSION_11_0) \
&& MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_VERSION_11_0
static int MacOSchecked, MacOSver;
/* This function is used implicitly by clang's __builtin_available() checker.
* When cross-compiling, the library containing this function doesn't exist,
* and linking will fail because the symbol is unresolved. The function here
* is a quick and dirty hack to get close enough to identify MacOSX 11.0.
*/
static int32_t __isOSVersionAtLeast(int32_t major, int32_t minor, int32_t subminor) {
if (!MacOSchecked) {
struct utsname ut;
int mmaj, mmin;
uname(&ut);
sscanf(ut.release, "%d.%d", &mmaj, &mmin);
// The utsname release version is 9 greater than the canonical OS version
mmaj -= 9;
MacOSver = (mmaj << 8) | mmin;
MacOSchecked = 1;
}
return MacOSver >= ((major << 8) | minor);
}
#endif
void setPrivilege(const char* pszPrivilege, BOOL bEnable) {
#if defined(_WIN32) || defined(__CYGWIN__)
#define Fail(func) do {*errfunc = func; return GetLastError();} while(0)
int setPrivilege(const char* pszPrivilege, BOOL bEnable, char **errfunc) {
HANDLE hToken;
TOKEN_PRIVILEGES tp;
BOOL status;
DWORD error;
DWORD error = 0;
*errfunc = NULL;
if (!OpenProcessToken(GetCurrentProcess(), TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY, &hToken))
throw std::runtime_error(getErrorMessage("OpenProcessToken"));
Fail("OpenProcessToken");
if (!LookupPrivilegeValue(NULL, pszPrivilege, &tp.Privileges[0].Luid))
throw std::runtime_error(getErrorMessage("LookupPrivilegeValue"));
if (!LookupPrivilegeValue(NULL, pszPrivilege, &tp.Privileges[0].Luid)) {
*errfunc = "LookupPrivilegeValue";
error = GetLastError();
goto out;
}
tp.PrivilegeCount = 1;
@ -85,20 +106,28 @@ void setPrivilege(const char* pszPrivilege, BOOL bEnable) {
status = AdjustTokenPrivileges(hToken, FALSE, &tp, 0, (PTOKEN_PRIVILEGES)NULL, 0);
error = GetLastError();
if (!status || (error != ERROR_SUCCESS))
throw std::runtime_error(getErrorMessage("AdjustTokenPrivileges"));
if (!status || (error != ERROR_SUCCESS)) {
*errfunc = "AdjustTokenPrivileges";
goto out;
}
if (!CloseHandle(hToken))
throw std::runtime_error(getErrorMessage("CloseHandle"));
out:
if (!CloseHandle(hToken)) {
if (*errfunc == NULL) {
*errfunc = "CloseHandle";
error = GetLastError();
}
}
return error;
}
#else
#define Fail(func) do {*errfunc = func; return errno;} while(0)
#endif
void* allocMemoryPages(std::size_t bytes) {
void* allocMemoryPages(size_t bytes) {
void* mem;
#if defined(_WIN32) || defined(__CYGWIN__)
mem = VirtualAlloc(nullptr, bytes, MEM_COMMIT, PAGE_READWRITE);
if (mem == nullptr)
throw std::runtime_error(getErrorMessage("allocMemoryPages - VirtualAlloc"));
mem = VirtualAlloc(NULL, bytes, MEM_COMMIT, PAGE_READWRITE);
#else
#if defined(__NetBSD__)
#define RESERVED_FLAGS PROT_MPROTECT(PROT_EXEC)
@ -112,9 +141,7 @@ void* allocMemoryPages(std::size_t bytes) {
#define MEXTRA 0
#define PEXTRA 0
#endif
mem = mmap(nullptr, bytes, PAGE_READWRITE | RESERVED_FLAGS | PEXTRA, MAP_ANONYMOUS | MAP_PRIVATE | MEXTRA, -1, 0);
if (mem == MAP_FAILED)
throw std::runtime_error("allocMemoryPages - mmap failed");
mem = mmap(NULL, bytes, PAGE_READWRITE | RESERVED_FLAGS | PEXTRA, MAP_ANONYMOUS | MAP_PRIVATE | MEXTRA, -1, 0);
#if defined(USE_PTHREAD_JIT_WP) && defined(MAC_OS_VERSION_11_0) \
&& MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_VERSION_11_0
if (__builtin_available(macOS 11.0, *)) {
@ -125,76 +152,81 @@ void* allocMemoryPages(std::size_t bytes) {
return mem;
}
static inline void pageProtect(void* ptr, std::size_t bytes, int rules) {
static inline int pageProtect(void* ptr, size_t bytes, int rules, char **errfunc) {
#if defined(_WIN32) || defined(__CYGWIN__)
DWORD oldp;
if (!VirtualProtect(ptr, bytes, (DWORD)rules, &oldp)) {
throw std::runtime_error(getErrorMessage("VirtualProtect"));
Fail("VirtualProtect");
}
#else
if (-1 == mprotect(ptr, bytes, rules))
throw std::runtime_error("mprotect failed");
Fail("mprotect");
#endif
return 0;
}
void setPagesRW(void* ptr, std::size_t bytes) {
void setPagesRW(void* ptr, size_t bytes) {
char *errfunc;
#if defined(USE_PTHREAD_JIT_WP) && defined(MAC_OS_VERSION_11_0) \
&& MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_VERSION_11_0
if (__builtin_available(macOS 11.0, *)) {
pthread_jit_write_protect_np(false);
} else {
pageProtect(ptr, bytes, PAGE_READWRITE);
pageProtect(ptr, bytes, PAGE_READWRITE, &errfunc);
}
#else
pageProtect(ptr, bytes, PAGE_READWRITE);
pageProtect(ptr, bytes, PAGE_READWRITE, &errfunc);
#endif
}
void setPagesRX(void* ptr, std::size_t bytes) {
void setPagesRX(void* ptr, size_t bytes) {
char *errfunc;
#if defined(USE_PTHREAD_JIT_WP) && defined(MAC_OS_VERSION_11_0) \
&& MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_VERSION_11_0
if (__builtin_available(macOS 11.0, *)) {
pthread_jit_write_protect_np(true);
} else {
pageProtect(ptr, bytes, PAGE_EXECUTE_READ);
pageProtect(ptr, bytes, PAGE_EXECUTE_READ, &errfunc);
}
#else
pageProtect(ptr, bytes, PAGE_EXECUTE_READ);
pageProtect(ptr, bytes, PAGE_EXECUTE_READ, &errfunc);
#endif
}
void setPagesRWX(void* ptr, std::size_t bytes) {
pageProtect(ptr, bytes, PAGE_EXECUTE_READWRITE);
void setPagesRWX(void* ptr, size_t bytes) {
char *errfunc;
pageProtect(ptr, bytes, PAGE_EXECUTE_READWRITE, &errfunc);
}
void* allocLargePagesMemory(std::size_t bytes) {
void* allocLargePagesMemory(size_t bytes) {
void* mem;
char *errfunc;
#if defined(_WIN32) || defined(__CYGWIN__)
setPrivilege("SeLockMemoryPrivilege", 1);
if (setPrivilege("SeLockMemoryPrivilege", 1, &errfunc))
return NULL;
auto pageMinimum = GetLargePageMinimum();
if (pageMinimum > 0)
mem = VirtualAlloc(NULL, alignSize(bytes, pageMinimum), MEM_COMMIT | MEM_RESERVE | MEM_LARGE_PAGES, PAGE_READWRITE);
else
throw std::runtime_error("allocLargePagesMemory - Large pages are not supported");
if (mem == nullptr)
throw std::runtime_error(getErrorMessage("allocLargePagesMemory - VirtualAlloc"));
if (pageMinimum <= 0) {
errfunc = "No large pages";
return NULL;
}
mem = VirtualAlloc(NULL, alignSize(bytes, pageMinimum), MEM_COMMIT | MEM_RESERVE | MEM_LARGE_PAGES, PAGE_READWRITE);
#else
#ifdef __APPLE__
mem = mmap(nullptr, bytes, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, VM_FLAGS_SUPERPAGE_SIZE_2MB, 0);
mem = mmap(NULL, bytes, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, VM_FLAGS_SUPERPAGE_SIZE_2MB, 0);
#elif defined(__FreeBSD__)
mem = mmap(nullptr, bytes, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_ALIGNED_SUPER, -1, 0);
mem = mmap(NULL, bytes, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_ALIGNED_SUPER, -1, 0);
#elif defined(__OpenBSD__) || defined(__NetBSD__)
mem = MAP_FAILED; // OpenBSD does not support huge pages
#else
mem = mmap(nullptr, bytes, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_HUGETLB | MAP_POPULATE, -1, 0);
mem = mmap(NULL, bytes, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_HUGETLB | MAP_POPULATE, -1, 0);
#endif
if (mem == MAP_FAILED)
throw std::runtime_error("allocLargePagesMemory - mmap failed");
mem = NULL;
#endif
return mem;
}
void freePagedMemory(void* ptr, std::size_t bytes) {
void freePagedMemory(void* ptr, size_t bytes) {
#if defined(_WIN32) || defined(__CYGWIN__)
VirtualFree(ptr, 0, MEM_RELEASE);
#else

26
src/virtual_memory.hpp → src/virtual_memory.h
View File

@ -28,15 +28,21 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#pragma once
#include <cstddef>
#ifdef __cplusplus
extern "C" {
#endif
constexpr std::size_t alignSize(std::size_t pos, std::size_t align) {
return ((pos - 1) / align + 1) * align;
#include <stddef.h>
#define alignSize(pos, align) (((pos - 1) / align + 1) * align)
void* allocMemoryPages(size_t);
void setPagesRW(void*, size_t);
void setPagesRX(void*, size_t);
void setPagesRWX(void*, size_t);
void* allocLargePagesMemory(size_t);
void freePagedMemory(void*, size_t);
#ifdef __cplusplus
}
void* allocMemoryPages(std::size_t);
void setPagesRW(void*, std::size_t);
void setPagesRX(void*, std::size_t);
void setPagesRWX(void*, std::size_t);
void* allocLargePagesMemory(std::size_t);
void freePagedMemory(void*, std::size_t);
#endif